[Case Study] Delivery of ADB Bearings to JAXA (Vacuum Environment)
Self-regulating decentralized rolling bearing
ADB bearings have been adopted for equipment used in a vacuum environment.
【Implementation Results: JAXA (Japan Aerospace Exploration Agency)】 ADB has been adopted for equipment used in harsh environments, such as attitude control for artificial satellites requiring long lifespans, thrust vector control for rockets requiring vibration resistance, and rotors for Mars drones requiring high-speed rotation. In particular, in a vacuum environment, it is difficult for the coatings on metal surfaces to regenerate, and the generated wear particles can accumulate inside the bearings in a sticky manner, potentially leading to failures. ADB contributes to the longevity and high reliability of bearings in vacuum environments by suppressing the generation of wear particles due to its structure that prevents contact between the balls.
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basic information
<Mechanism and Structure of ADB> The mechanism of ADB ("Autonomous Distributed Rolling Bearing") is very simple. There is a small "indentation" where the balls of the outer ring make contact. In a conventional bearing, the balls roll directly beneath the shaft, but in ADB, the indentation on the outer ring causes the balls to roll slightly offset from directly below. As a result, even when the balls make a complete rotation, the distance they travel is shorter. This causes the balls to slightly decelerate when passing through the indentation and then accelerate again after passing through it. Furthermore, behind the accelerated balls, the following balls are still decelerating, creating a small gap between the balls. ADB utilizes this principle to naturally separate the balls from each other without the use of a retainer.
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※We will customize and manufacture individually according to the purpose, so the delivery time will vary.
Applications/Examples of results
<Aerospace Field> ■Delivery Record: JAXA ADB has been adopted for equipment used in harsh environments, such as attitude control for artificial satellites requiring long life, thrust vector control for rockets requiring vibration resistance, and rotors for Mars drones requiring high-speed rotation. <Marine Research Field> ■Delivery Record: JAMSTEC Leveraging the feature of being able to use seawater directly as a lubricant, ADB has been adopted for equipment used in seawater environments. <Machine Tools, Robotics, and Canning Field> ■Delivery Record: OSG, DMG Mori Seiki Thanks to ADB's ability to rotate with low torque, it contributed to achieving a high speed of 30,000 rpm, approximately 2.5 times faster than before. It is also used for improving the efficiency of robotic movements and reducing takt time. <Energy Field> ■Delivery Record: Railway Technical Research Institute, Wind Power Generation Companies ADB has been adopted as a touchdown bearing used in the event of magnetic bearing failure. <Automotive and Engine Field> ■Delivery Record: Toyota Motor Corporation, among others A design report for ADB capable of handling high-speed rotation conditions of 180,000 rpm with a shaft diameter of 33 mm was delivered for turbochargers, which are particularly exposed to harsh environments among automotive parts.
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